Electrically-operated motor-vehicle.



J. C. MAGFARLANE zV BUEGEL ELETRIOALLY OPB'IED MOTOR EH'lGLE.

n PLIQATIoH FILED mms, 1212.

i vplica'ble to electrically operated motor vel motors operating separately. Thus in the -United States Letters PatentV N os: 980979 trolled by a regulator and with a starting switch. In many cases'it is desirable, however, to emplov a single motor and under "`system, and obtain the automatic regulation i "pled to the shaft of the motor enerator,

VUNITED STATE-s PATENT orrion.

JAMES C. MACFARLANE ANDHENRY'BURGE, 0F .ARC WORKS, CHELMSFORD, ENGLAND, ASSIGNORS TO CROMPTON 6c COMPANY LIMITED, OFy CHELMSFORD, ENGLAND.

nLEcTnIoALLY-OPERATED Moron-VEHICLE.

v 1,049,247.' Specification 0f "Letters Patent Patented Dee. 31, 1912.

, Application led .Tune 6, Y1912. Serial No. 702,125.

To aZZ 'whom it may concern.

Be it known that we, JAMES CoLQUHoUN MACFARLANE and HENRY BURGE, subjects of 'the King of Great Britain, residing at Arc Vorks, Chelmsford, in the county of Essex, England, have invented certain new and Auseful Improvements in Electrically-Operated Motor-Vehicles, of which the following is a specification.

his invention relates to a modification of an electrical regenerative control system already described .by us in certain earlier United States Patents and is especially aphe driving motor is provided with two sets of eld windings one winding called the constant excitation winding7 being arranged across the battery leads and the second winding called the auxiliary winding instead of being arranged as described in the 6o said earlier Unit ing motors across the leads, is arranged across the brushes of the aforesaid generator.

The generator of the motor generator is provided with a safety winding whose effect is different according as the motor is being driven ty the current or is returning energy to the line. When current is being supplied to the driving motor from the generator, increase of such current causes the atloresaid generator safety winding to reduce the volt` age of the supply thus limiting the current flowing, and when the supply voltage is below the back E. M. F. of the driving motor so that the motor is returning energy, the said safety winding increases the voltage of the supply so as to limit the amount of the current returned to the line bythe'working 80 motor. l

yIn order that the invention may be clearly understood we proceed to describe the same with reerenceto the accompanving drawings in which-` igure l represents diagrammatically the system employed and Fig. 2 represents the application of the system to an electrically operated motor vehicle.

Referring to Fig. l, A is the motor and B the generator, C'is the working motor whose armature is connected in series with B across the mains to which energy is supplied by th e hlcles.

In our previous United States Letters Patent No. .980979, datedl January 10,1911, and No. 998364dated July 18,1911, we described an electrical system suitable among other purposes for driving the road wheels of a motor vehicle. v

The present invention is a modification of such system which comprisedtwo working application to a motor vehicle the separate vehicle separately. e separate motors as described in and'998364 are connected with their arma- 85 mains, or leads froma battery, and are provided with regulating field coils ,in series with' one another and with one of the motors -across the line, the said generator being provided with a reversible shuntexcitation conh pircumstances, we modify the aforesaid .ojthe single motor in a different way.

IfrAccording to this invention we employ a motor and a generator whose armatures are motor generator to take the mean load. The motor A is a separately excited machine whose armature is across the mains. The f generator B is provided with a variable reversible shunt excitation K controlled by the regulator E. .hen the regulator E is over to the right (say), the generator adds its voltage to the battery and can boost the volts on the motor C up to twice the battery voltfroIn a battery and partly om a petrol engine or prime mover cougenerator B boosts the'volts on the motor C down to Zero. The motor C is provided with agdadapted tio-'take the mean loa two sets of windings namely a windingH age, but when the regulator is to the left, the

F, F, arranged across the brushes of the generator B. The electrical etfectof these windings has been fully described with reference to Fig. l. We control the regulator E by means of a foot pedal 2G and the pedal 20 and the switch S are the only means of control required. We may employ a petrolengine or other prime mover P mounted .on the shaft of the motor generator, provided with a drooping speed torque characteristic, to take the mean load, in which case the size ot the battery required is greatly reduced.

lVhat we claim is l 1. In a system for the Vpropulsion of the drivingr wheels of a self-propelled vehicle, an electric motor connected so as to drive both said driying wheels, a source of power supplying energy to said electric motor, said source of power including a battery and a motor generator having a motor element and a generator element, a starting and reversing switch, a variable controller for said source of power, a single foot pedal operably connected tosaid variable controller, and means to. regulate automatically the torque of said electric motor ,when4 the vehicle is ruiming at low 'speeds and also for braking the vehicle electrically.

2. In a system for the propulsion of the driving wheels of aA self-'propelled vehicle, an electric motor connected seas to drive both said driving wheels, a source of .power supplyingr energy to said electric inotor, s id source of power including a" battery and a motor generator havingr a motor element and a generator element, said battery, moto-r generator and electric motor being arranged in series, a starting and reversing switch, a variable controller for said source ot' power, a single foot pedal operably connected to said variable controller, and means to regulate automatically the torque of said electric niotor when'the vehicle is running at low speeds and also for braking the vehicle electrically. l

3. In a system for the propulsion of the ,driving wheels of a self-propelled vehicle,

an electric motor connected so as to drive both said driving wheels, a source of power supplying energy to said electric motor, said' source ot power including a battery and a motor generator having a motor element and a generator'element, said battery, mo-

tcr generator and electric motor being arranged in series, a starting and reversing switch, a variable reversible shunt regulator connected with said battery and with said motor generator, a single foot pedal operably connected to said variable reversible shunt regulator, and means to regulate automatically the torque of said electric m0- tor when 4the vehicle is running at low speeds and also for brakingy the vehicle electric-ally.

. 4. In a system for the propulsion of the driving wheels of a self-propelled vehicle, an electric motor connected so as to drive both said driving wheels, a source of power supplying energy to said electric motor, said source of power including a battery and a motor generator havinga motor element and a generator element, said battery, motor generator and electric motor being arranged in series, a starting and reversing switch, a variable reversible shunt regulator connected with said'battery and with said generator element for the excitation of the field of said generator element, a single foot pedal operably connected to said variable reversible shunt regulator, and auxiliary field winding on said' motor and arranged across said generator, and a series field winding on said generator, said windings combining to regulatev automatically the torque of said electric motor when the vehicle is running at low speeds and also for bra-king the vehicle electrically.

5. In a system for the propulsion of the driving wheels of a self-propelled vehicle, an electric motor connected so as to drive both said driving wheels, a source of power Supplying energy to said electric motor, said source of power including a battery and a motor Agenerator having a motor element and a generator element, a prime mover coupled directly to saidmotor generator, said battery, motorv generator and electric motor being arranged in series, a starting and reversing switch, a variable reversible shunt regulator connected with said battery and with said generator element tor the excitation ot the field of said generator element, a single foot pedal operably connected to said variable reversible shunt regulator,

.an auxiliary field winding on said motor and arranged across said generator, and a. series field winding on said generator, said windings ycombining to regulate automatically the torque of said electric motor when the vehicle is running at low speeds and also for braking the vehicle electrically.

6. In a system for the propulsion of the driving wheels of a self-propelled vehicle, an electric motor connected so as todrive both said drivingwheels, a source of power supplying energy to said electric motor, said source of power including a battery and amotor generator having a motor, element and a generator element, an internal coinbustion engine coupled directly to said motor generaton'said battery, motor generator and electric motor being arranged in series, a starting and reversing switch, a variable reversible shunt regulator connected with said battery and with said generator element for the excitation of the field of said generator element, a single foot pedal oper ably connected to said variable reversible shunt regulator, an auxiliary field winding tric motor when the vehicle is running at on said motor and arranged across said genset our hands in presence of two subscribing erator, and a serles eld Wmdlng on sald Wltnesses. generator, sind Wlnclmgs combmmg to regulate automatically the torque of said elec- JAMES C' MACFARLANE' HENRY BURGE.

10W spccds and also for braking the Vehicle Vttnesses: electrically. HARRY JOHN STOGDEN, In testimony whereof We have hereunto ERNEST JOHN HILL. 

